呼气肌主要由腹外斜肌、腹内斜肌和腹直肌组成。呼吸时呼气肌能与肋间肌相配合 ,可增加胸腔内压、降低肺容积和加快呼气流速 ,因此呼气肌的收缩被认为是机体的一种功能储备。已有研究显示 ,ＣＯＰＤ病人呼气肌耐力有所下降 ,但尚无针对其耐力下降及其临床影响的研究。为此作者 Breath expander mainly by the external oblique, abdominal oblique and rectus abdominis muscle composition. Breathing respiratory muscles can be intercostal muscle coordination, can increase intrathoracic pressure, reduce lung volume and speed up expiratory flow, the contraction of the expiratory muscle is considered to be a functional reserve of the body. Studies have shown that COPD patients decreased expiratory endurance, but no study of its endurance decline and its clinical impact. For this author